Fluid behavior investigation on a single-phase ejector using numerical approach

Abstract

This study aims to determine fluid flow behaviors and its property inside of an ejector for a single-phase system. Numerical simulation has been employed to investigate the efficiency of the ejector. The numerical process begins with model creation, mesh sensitivity study, turbulent model selection and validation study. Seven parts of ejector that can be optimized to achieve the objectives namely nozzle diameter, venturi tube neck diameter, nozzle distance, venturi tube neck length, straight pipe length, mixing chamber diameter, and mixing chamber length. Through these seven aspects, a total of 82 design points has been generated by CFD software and have obtained a candidate that provides optimized parameters that are 2.12mm, 18.93mm, 3.12mm, 80.71mm, 195.9mm, 138.63mm and 165.64mm. These parameters that contribute to the optimized output have contributed 0.0462% efficiency than before. This also shows that this ejector model does not require significant changes because this model is said to be close to the optimized ejector. Through these seven modifiable parameters, a total of 82 design points has been generated by MOGA algorithm and have obtained a candidate that provides optimized parameters that are 2.12mm, 18.93mm, 3.12mm, 80.71mm, 195.9mm, 138.63mm and 165.64mm. These parameters that contribute to the optimized output have contributed 0.0462% efficiency.